Question # 1

The distillation of liquid under reduced pressure is called.

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Destructive distillation

Vaccum distillation

Simple distillation

Fractional distillation

Which is not use of liquid crystals.

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Temperature sensor

Liquid crystal display

Skin thermography

Energy supply in electrical devices.

Exceptionally low acidic strength of HF is due to.

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Strong polar bond between H and F

Smaller size of fluorine

Strong hydrogen bonding

electronegativity of fluorine

Which one of the following substances is not amorphous

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Polymer

Rubber

Glass

AgNO₃

The molecules of CO2 i dry ice form the.

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Ionic crystals

Molecular crystals

Amorphous

Covalent crystals

A pressure cooker reduces cooking time because.

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Heat is uniformly distributed

Boiling point of water rises

A large flame is used

Vapour pressure of liquid reduces

The boiling point of pure water at 1 atm pressure is.

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98^oC

100^oC

69^oC

120^oC

The boiling point of glycerin at one atm is.

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280 ^oC

290 ^oC

100 ^oC

110 ^oC

NH3 shows a maximum boiling point among the hydrides of the group V elements due to.

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Very small size of nitrogen

Long pair of electrons present on nitrogen

Enhanced electronegative character of nitrogen

Pyramidal structure of NH3

Diamond is bad conductor because.

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It has a tight structure

It has a high density

It is transparent to light

There are o free electros present in the crystal of diamond to conduct electricity.

Which one of the following inter molecular forces are present in neon gas molecules.

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Hydrogen bond

dipole -Dipole attraction

London dispersion force

Hydrogen bonding and London dispersion force

The long chains of amino acids are coiled about one another onto a spiral by

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Ionic bond

Van der walls forces

Hydrogen bonding

Overlapping of orbitals

Vapour pressure of a substance does not depend upon.

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Temperature

Intermolecular forces

Surface area

Physical state of water

One of the following liquids has lowest vapour pressure at 32°C. Indicate that liquid

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Ether

Chloroform

Ethanol

Water

The boiling point of water at Murree Hills.

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90^oC

98^oC

100^oC

120^oC

Conductivity of metal decreases by increasing temperature because.

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Atoms are converted to ions

Atoms oscillates and hinder the movement of free electrons.

Ions are converted into atoms

Velocity of mobile electrons increases

The distillation of a solution under reduced pressure is called

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Fractional distillation

Destructive distillation

Distillation

Vacuum distillation

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